Fred et al., in 2006 during Atlas safe dates (I don't have the date handy but it was either in early June or late/mid May) an adult Horned Lark flew over us at Kenilworth Park.  Where it came from, I don't know.  I believe I put that down as an "O" for observed since it was not flying over proper habitat.  Nobody that I'm aware of has seen Horned Lark at either Kenilworth Park or Kenilworth Aquatic Gardens this year since May began.  Paul Pisano has been there more often than I have this year; maybe he can shed some light on the subject.  

Rob Hilton
Silver Spring